The bitcoiners must have plan B. You must not have only 1 backup. You must have at least 2 backups to avoid an unexpected incident. I am stamping mnemonic seed on steel plat, and also write them on another plat and keep it on another place (safe box). So if that main plat broken or something, I have the back up to access my btc.
I also keep the private key on flash disk where I never use it online on my PC.
Plan B can be in many practice from having income from your jobs, having emergency fund to use just in case, storing your bitcoin in different wallets, then making multiple wallet backups. If you don't have many wallets to store your bitcoin, and only store bitcoins in a single wallet, you can lose all bitcoins in a single accident.
Then a next step is your recommendation, making multiple wallet backups in order to have different options for wallet recovery that is important for your bitcoin fund. The initial wallet can have technical or physical issue anytime, and have other backups to use vital.